How to change the default login background on macOS Mojave.

If you want to change the macOS Mojave background wallpaper image that displays with your login, simply replace the /Library/Desktop Pictures/Mojave.heic file with any suitably sized jpeg renamed to ‘Mojave.heic’.

The default macOS login screen background image is called “Mojave.heic” and is located in the folder: /Library/Desktop Pictures/

Specifically to change the login image do the following:

  1. Go To: /Library/Desktop Pictures/
  2. Find the file called “Mojave.heic”
  3. Save a copy as a backup somewhere else
  4. Replace the file with a jpeg renamed to “mojave.heic”

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